I just skimmed the thread, honestly, but I think I got the gist of it.
It sounds like you have settled on a 60mm. If that's your only lens (at the moment), I think it's a great choice. I have one myself--a CF version, along with a 50mm CF FLE, 80mm CF, 120mm CFi, 150mm CF, and 180mm CFi.
I started with an 80mm and 150mm, then added the 50mm (a plain CF at first, and then the FLE version when I found one at a great price). I added the 120 later because I love macro shooting and the 180mm because it's stunning for portraits (I was running a commercial studio when I got it). The last lens I added was the 60mm.
I wanted that one because, for a single carry-around lens, the 60mm gives me the wider-than-normal field of view I love for walkaround shooting, it's fast enough for daylight, it's fairly compact (much more so than the 50 FLE or a 40mm), and the image quality is stellar. And even though it's very close to the 50mm and rather close to the 80mm, it gives me a noticeable enough difference in angle of view from either of those to be useful even with those two lenses--however, as I said, the main reason I bought it is because if I want to go out walking with only a single lens, for me the 60 is perfect.
One thing to consider, as I did, is trying to get all your lenses from the same series--that allows you to swap lens hoods and filters between multiple lenses. I settled on the CF lenses (and CFi) because they all use the Bay 60 filter (the lenses I have do; the 40mm doesn't), and I far prefer the ergonomics (focusing ring, no shutter/aperture interlock) of the CF and later lenses to the C versions.
If you start with the 60 and then decide to go longer along with it, the 100mm would potentially make sense as there's a bit of a spread between the two. However, it might be even more sensible to go with the 120mm Makro-Planar, as that doubles your focal length, and you can shoot closeups or portraits with that lens. Or if you go with the 150mm--which is lighter than the 120 and nice for carrying around--you end up with a combo that's sort of like a 35mm and 105mm in 35mm format, which is really a very useful pairing indeed.